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· Aug 18, 2021

How convert a String to HTML Entity Codes?

#Caché #InterSystems IRIS

Good morning everybody,

In Html sometimes we need to use entities code for don't have problems with browsers all over the world. Ex. 'á' is converted to code: 'á' / 'é'  is converted to 'é'. 

I have a question, how can i convert a string like my name to this type of code? Ex. "Flávio" will be "Flávio". I tried this way:

USER>write $zconvert("Flávio","I","HTML")
Flávio

but don't worked :(
 

Best Regards.

Product version: Caché 2018.1
Discussion (10)2
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Marc Mundt · Aug 18, 2021

A couple of things...

You'll want to use "O" (output) mode instead of "I" (input) mode:
write $zconvert("Flávio","O","HTML")

However, I see that this still doesn't replace the "á". But if I add an "&" it replaces it with "&" as expected:
write $zconvert("Flávio&","O","HTML")

The table at the bottom of this section in the documentation lists which characters are encoded into entities in HTML mode.

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Julius Kavay · Aug 18, 2021

I think, the $zconvert() function will cover only the necessary entities. But you can use a simple method to convert characters to currently known(*) entities.

ClassMethod ToHTML(str)
{
   for i=$length(str):-1:1 set c=$ascii(str,i) set:$data(^entityChars(0,c),c) $extract(str,i)=c
   quit str
}

ClassMethod FromHTML(str)
{
   set i=0
   while $locate(str,"&[A-Za-z]+;",i,j,v) {
   set:$data(^entityChars(1,v),c) s=$length(v), $extract(str,j-s,j-1)=$c(c), j=j-s+1
   set i=j
   }
   quit str
}

I have a table (the ^entityChars() global) which contains more the 1400 entities. You can download the above class, together with the table from my FTP server (File: DC.Entity.xml):

Adr: ftp.kavay.at
Usr: dcmember
Psw: member-of-DC

A sample output:

USER>write ##class(DC.Entity).ToHTML("Flávio Lúcio Naves Júnior")
Flávio Lúcio Naves Júnior
USER>write ##class(DC.Entity).FromHTML("Flávio Lúcio Naves Júnior")
Flávio Lúcio Naves Júnior

(*) Currently known, because (1) I do not have all the currently known entities in my table and (2) with each new day, the W3C and the Unicode consortium can extend the current entity list.

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